Precast concrete construction



Nov. 17, 1959 K. c. WISSINGER 2,912,849

PRECAST CONCRETE CONSTRUCTION Filed Jan. 10, 1958 Kenneth '6. Wiss'ihger 1 N VEN TOR.

United States Patent PRECAST CONCRETE CONSTRUCTION Kenneth C. Wissing er, Altoona, Pa. Application January 10, 1958, Serial No. 708,107 3 Claims. (Cl. 72-61) This invention relates to a precast concrete section that has a multiplicity of uses such as for walls, columns and floor and roof systems.

An object of the invention is to provide a precast concrete section that utilizes the compression strength of the concrete to a high degree of efficiency.

My precast concrete shape or section will permit the use of low cost standard pipe as forms in a manner that will simplify prestressing, allowing application of simple mechanized equipment for form setting, pouring and stripping as well as cleaning on a large scale production basis.

The precast shape can be used as a unit or units of a Wall and floor system or of a deck including columns that are capable of being quickly bolted together to form a reinforced concrete structure for eflicient erection by mechanized equipment.

My section can use a preformed reinforcing system that can be placed as a unit and will resist normal stress of handling and erecting, the shear and bending stresses developed from loading applications as a beam and the vertical and lateral stresses of columns and preloading, in addition to the good and sufficient anchorage of sleeves in my section that are used for bolting and which also act as a spreader in the assembly of the forms.

Another object of the invention is to apply expanded metal or like material to armor the minor cavities and reinforce the exposed edges of the flanges of my section. The sectionhas concrete of hard, dense type by which the flanges are made, and light, insulating concrete in the web. In addition, in several embodiments of my invention I allow the passage of service lines such as pipes and conduits, by openings in the webs that are armored to assure that ample strength at this point of the shape exists.

These together with other objects and advantages which will become subsequently apparent reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawings forming a part hereof, wherein like numerals refer to like parts throughout, and in which:

Figure 1 is a perspective view of a precast concrete section or shape that is ready for use.

Figure 2 is a schematic view showing the reinforcing in cross section with part of the reinforcing omitted and the concrete omitted.

Figure 3 is a sectional view taken on the line 3-3 of Figure 2 but showing the concrete in elevation.

Figure 4 is an enlarged sectional detail showing the juncture of several of the parts and the reinforcing network of the precast concrete section.

Figure 5 is a fragmentary perspective view with parts omitted, showing a modification of the reinforcing wires or bars that extend from the flanges through the web .of the section.

In the accompanying drawing there is a precast con- This is made of concrete which is homogeneous or which 2 has two or more compositions. One preferred embodiment has the upper and lower flanges 12 and 14 made of hard, dense concrete, while the web or at least the core of the web 16 is made of lightweight insulating cement. The cross-sectional shape of my section is that of a modified I-beam with the web having its outer surfaces rounded.

A reinforcing network 18 in section 10 is constructed of an upper group 20 of reinforcing rods and a lower group 22 of reinforcing or prestressting rods or wires. The rods are embedded in the flanges and are approximately parallel to each other. The rods in group 20 could vary in number depending on the size of section 10. The illustration has three intermediate rods 23, 24 and 25 and two outer rods 26 and 27 along the upper and outer edges of the upper flange 12. The lower group 22 of rods includes intermediate rods 30, 31 and 32 plus the outer rods 33 and 34. The outer rods are located in the lower outer corners of lower flange 14. The intermediate rods 23, 24and 25 are disposed in notches 36 of spacer 38 that extends transversely across the upper flange 12. The spacer 38 is a short piece .of pipe or tubing with the notches 30 in the walls thereof. These provide for the possible acceptance of rods when bolting a number of sections 10 together or otherwise joining them. They also provide for ease in transversely post stressing. The outer rods 26 and 27 are on the upper surfaces of the spacer 38. Intermediate rods 30, 31 and 32 are in notches 40 of spacer 42. This spacer is in the lower flange 14 of section 10 and responds in function and construction to spacer 38. The outer rods 33 and 34 are at the ends of spacer 42. It is to be noted that the notches 40 are inwardly of the web 16 while the notches 36 are outwardly of web 16. This is to show that the reinforcing rods can be placed in either location.

Bars or wires constitute a part of the reinforcing network. In Figure 2 the bars 56 and 58 are on opposite sides of the short spacer 60. This spacer is in the center of the web and is a short piece of pipe on whose sides the intermediate parts of bars 56 and 58 are'welded. Bar 56 has an arcuate center part 61 following the contour of the surface of the web 16, and straight ends 62 and 63 that extend through parts of the web and parts of the upper and lower flanges. The terminal parts of the ends 62 and 63 are welded to the reinforcing rods 26 and 33. Bar 58 has an arcuate center part 64 and straight ends 65 and 66 extending therefrom. The extreme terminal parts of ends 65 and 66 are welded to reinforcing rods 34 and 27 respectively. (See Figure 4.)

Two elongated form panels 68 and 69 are in the lateral surface areas of the web and flanges. It is preferred that these panels be made of expanded metal or some other apertures metal. Panel 68 has an arcuate (in cross section) center portion 70 which follows the curve that actually helps to form the curve of the web. Strips 71 and 72 are along the outer edges of the upper and lower flanges respectively and these protect the edges of the flanges. Panel 69 is constructed in the same way.

In order to care for the passage of service lines, pipes, etc. one or more openings 73 are formed completely through the web 16. Spacers 60 form openings through the web in a direction transverse to the longitudinal axis of my section 10, but openings 73 are to be larger. The openings formed by spacers 60 are primarily intended to receive tie wires, bolts, etc. but could be used for services, for example, a BX cable in certain applications. Openings 73 are reinforced in their walls by a cylindrical form 74 of apertured metal that is embedded in the concrete of the section 10. It is arranged transversely of the longitudinal axis of the section and materially strengthens the wall of opening 73. As shown in Figure 3 a light brace c; 75 can be welded between reinforcing rods to hold them in shape and assemble properly during pouring.

Reference is now made to Figure 5. In this modification, there are four reinforcing wires or bars 80, 81, 82 and 83, which like bars or wires 56 and 58, serve a connecting as well as reinforcing function. The bars 80, 81, 82 and 83 differ from those of Figure 2 by being formed completely arcuately instead of having only a portion of an arc with straight ends. The attachment to the end reinforcing rods is the same as described in connection with Figure 2 and the function of the bars 80, 81, 82 and 33 is the same as the function of bars as and 58.

The foregoing is considered as illustrative only of the principles of the invention. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction and operation shown and described, and accordingly all suitable modifications and equivalents may be resorted to, falling within the scope of the invention as claimed.

What is claimed as new is as follows:

l. A precast concrete construction comprising a beam having upper and lower flanges and an interconnecting web portion, a plurality of longitudinally spaced tubes embedded Within said upper and lower flanges and extending transversely thereof and completely therethrough so as to open upon opposite sides of said flanges, said tubes being arranged in said upper and lower flanges in vertically registered pairs and there being a spacer tube aligned substantially medially between the tubes of each pair within said web and extending completely therethrcugh to open on both sides thereof, reinforcing bars interconnecting each pair of tubes and intermediate spacer tube, and longitudinally extending reinforcing rods in said upper and lower flanges interconnecting the tubes therein.

2. A precast concrete construction comprising a beam having upper and lower flanges and an interconnecting web portion, a plurality of longitudinally spaced tubes embedded within said upper and lower flanges and extending transversely thereof and completely therethrough so as to open upon opposite sides of said flanges, said tubes being arranged in said upper and lower flanges in vertically registered pairs and there being a spacer tube aligned substantially between the tubes of each pair within said web and extending completely therethrough to open on both sides thereof, the tubes in said upper and lower flanges being transversely notched, longitudinally extending reinforcing rods received in the notches of said tubes and secured rigidly thereto to interconnect such tubes, and reinforcing bars interconnecting each pair of tubes and the intermediate spacer tube associated therewith.

3. The assembly as defined in and by claim 2 wherein the web portion presents concave opposite side edges, said reinforcing bars being of generally U-shaped configuration having mutually divergent legs extending into the outer edges of the upper and lower flanges and having bight portions disposed substantially at the outer surface of the opposite side edge of the web.

References Cited in the file of this patent UNITED STATES PATENTS 992,994 Smith May 23, 1911 2,211,667 Moesly Aug. 13, 1940 2,252,980 Rhett Aug. 19, 1941 2,396,045 Henderson Mar. 5, 1946 FOREIGN PATENTS 341,597 France of 1904 567,452 France of 1923 525,679 Great Britain of 1940 628,626 Great Britain W of 194 

